Police are now looking for a group of vandals that worked Wednesday morning to let subway riders at thee stations across Manhattan and Brooklyn ride free. The group -- wearing masks, hoods and gloves -- chained open emergency gates, taped over the MetroCard readers and posted signs that read, "customers ride for free." According to the New York Times investigators are still trying to determine whether the group acted "as part -- or in sympathy with --" Occupy Wall Street or another protest group. "We don't know who is behind the incidents or what the motivation is," an NYPD spokesman said Saturday. On Thursday, reports emerged that about 20 stations across the city saw gates opened to protest MTA cutbacks. [NYT]